Lesson: Standard Molar Gas Volumes Chemistry • 10th Grade

In this lesson, we will learn how to calculate the molar volume of a gas from the gas volume and number of moles under standard conditions.

Lesson Plan

Students will be able to

state the formula for calculating molar volume,
calculate the molar volume of a gas from the gas volume and number of moles,
recall that the standard molar gas volume at room temperature and pressure (RTP) is 24 dm³/mol,
recall that the standard molar gas volume at standard temperature and pressure (STP) is 22.7 dm³/mol,
describe what conditions constitute RTP and STP (RTP: 1 bar and 20 degrees Celsius, STP: 1 bar and 0 degrees Celsius),
calculate the volume or number of moles of gases at RTP,
calculate the volume or number of moles of gases at STP.

Lesson Video

Lesson Worksheet

Q1:

What is the volume of 2.0 mol of oxygen at room temperature and pressure (RTP)?

Q2:

At room temperature and pressure (RTP), a sample of oxygen occupies a volume of 10.0 L. How many moles of gas molecules are present, to 3 decimal places?

Q3:

Which of the following is the correct definition of room temperature and pressure (RTP)?